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Displays the type of image

<?php if($img = @GetImageSize("ihcomputing1.gif")) { switch ($img[2]) { case 1 : echo "image is a gif"; break; case 2 : echo "image is a jpeg"; break; case 3 : echo "image type is PNG"; break; case 4 : echo "image type is SWF"; break; case 5 : echo "image type is PSD"; break; case 6 : echo "image type is BMP"; break; } } else { echo "image does not exist"; } ?>